If you want to use the board I can probably give you the pinout of an output cable from my board and it'll no doubt work. (That board really does look like a straight-up clone.) Mine doesn't have the back panel thing, it just has a cable that plugs into that header. (Mine actually came with a *different* setup to allow switching between the 80 and 40 column modes on the same monitor, but the card will also work simply as a "second head" inside the system.) I would recommend removing it during any troubleshooting you're trying to do, though. Same for the Z-80 card for that matter.
(If you really aren't interested in either board I could possibly be willing to take them off your hands. Heck, if you decide the whole computer is a loss I could probably use a spare. I mention this because based on your location it'd probably be a local transaction.)
